Difference in autonomic nervous effect of blue light depending on the angle of incidence on the eye

Yuda, Emi; Yoshida, Yutaka; Hayano, Junichiro

doi:10.1186/s13104-020-04988-5

Cited by 4 publications

(6 citation statements)

References 20 publications

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“…Natural blue light can regulate our sleep and wake cycles, boost alertness, modulate mood, etc., but prolonged exposure to blue light at night can disrupt circadian rhythm and can cause many additional health issues, such as diabetes, heart disease, and depression. Most importantly, it can cause permanent eye damage and age-related macular degradation, leading to vision loss (Figure d(I)). − …”

Section: Introductionmentioning

confidence: 99%

Carbon Dot/Cellulose-Based Transparent Films for Efficient UV and High-Energy Blue Light Screening

Barman

Handegård

Hashimoto

et al. 2021

ACS Sustainable Chem. Eng.

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Our eyes and skin are routinely exposed to hazardous ultraviolet light (UV) from sunlight as well as to high-energy blue light (HEBL) from modern IT devices. Therefore, it is essential to protect our health by blocking this harmful high-energy radiation. In this study, we demonstrated a biodegradable, transparent, flexible film that blocks this dangerous radiation using cellulose-encapsulated, nitrogen-doped, carbon dots (NCDs). The interaction between cellulose and NCDs by H-bonding enables effective incorporation of NCDs into the cellulose matrix (NCDs@cel). This film blocks UV-A and UV-B as well as HEBL. Absorbed UV and HEBL are converted into lower-energy (longer-wavelength) light in the blue to green region, reflecting its excitation-dependent emission properties. Hence, the film protects us from exposure to harmful photoradiation. The film’s excellent visible transparency at 540 nm, strong UV blocking, and downconverted emission wavelengths can readily be tuned by simply adjusting the concentration of NCDs in the cellulose film. This hybrid film offers promising solutions to efficiently block UV and HEBL light simultaneously, potentially enabling practical applications such as window coatings against sunlight or for display screens.

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Section: Introductionmentioning

confidence: 99%

Carbon Dot/Cellulose-Based Transparent Films for Efficient UV and High-Energy Blue Light Screening

Barman

Handegård

Hashimoto

et al. 2021

ACS Sustainable Chem. Eng.

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“…Glickman et al [ 45 ] also demonstrated that nighttime white light exposure to the inferior retina caused melatonin suppression, while exposure to the superior retina caused no significant suppression. In a previous study, we also investigated the effect of the angle of incidence on the autonomic effects of blue light and observed similar effects with light from directly above [ 31 ]. The present observations indicate that the biological effects of the non-imaging function of blue light could be regulated separately from the subjective comfort caused by the image-forming function by choosing different directions of light into the eye for ambient and task light.…”

Section: Discussionmentioning

confidence: 91%

“…The ambient lighting was designed to illuminate from a direction perpendicular to the subject's visual axis. In a previous study, we examined whether the autonomic responses to blue light depends on the angle of incidence to the eye in healthy subjects, but no significant difference was observed in autonomic indices of heart rate variability for a wide range of angles of incidence from -90° to +90° [ 31 ]. This suggests that the biological effects of the non-imaging function of blue light may be regulated separately from the subjective comfort at least that is caused by the image-forming function by choosing different directions of light into the eye.…”

Section: Introductionmentioning

confidence: 99%

Ambient-task combined lighting to regulate autonomic and psychomotor arousal levels without compromising subjective comfort to lighting

Hayano

Kisohara

Yoshida

et al. 2021

J Physiol Anthropol

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Background Although evidence of both beneficial and adverse biological effects of lighting has accumulated, biologically favorable lighting often does not match subjectively comfortable lighting. By controlling the correlated color temperature (CCT) of ambient lights, we investigated the feasibility of combined lighting that meets both biological requirements and subjective comfort. Methods Two types of combined lightings were compared; one consisted of a high-CCT (12000 K) light-emitting diode (LED) panel as the ambient light and a low-CCT (5000 K) LED stand light as the task light (high-low combined lighting), and the other consisted of a low-CCT (4500 K) LED panel as the ambient light and the same low-CCT (5000 K) stand light as the task light (low-low combined lighting) as control. Ten healthy subjects (5 young and 5 elderly) were exposed to the two types of lighting on separate days. Autonomic function by heart rate variability, psychomotor performances, and subjective comfort were compared. Results Both at sitting rest and during psychomotor workload, heart rate was higher and the parasympathetic index of heart rate variability was lower under the high-low combined lighting than the low-low combined lighting in both young and elderly subject groups. Increased psychomotor alertness in the elderly and improved sustainability of concentration work performance in both age groups were also observed under the high-low combined lighting. However, no significant difference was observed in the visual-analog-scale assessment of subjective comfort between the two types of lightings. Conclusions High-CCT ambient lighting, even when used in combination with low-CCT task lighting, could increase autonomic and psychomotor arousal levels without compromising subjective comfort. This finding suggests the feasibility of independent control of ambient and task lighting as a way to achieve both biological function regulation and subjective comfort.

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“…Because of the small number of participants, it is hard to apply these results to the general population. Studying the consequences of blue light exposure at a systemic level may also require longer study periods than those used in Yuda et al’s studies [ 50 , 51 , 115 ]. This eliminates the possibility of a situation in which the systemic response to blue light may have not been fully saturated and may have progressed further than the study period.…”

Section: Discussionmentioning

confidence: 99%

“…Even though studies have shown that blue light induces a sustained higher arousal and alertness state, these results should be interpreted with a great deal of caution, as baseline data was not collected and possible differences in autonomic (some also influenced by the menstrual cycle) and psychomotor performance cannot be firmly excluded. Starting from the idea that white light exposure to the inferior retina causes greater melatonin suppression when compared with exposure to the superior retina [ 116 , 117 ], Yuda et al investigated the autonomic effects of blue light emitted by OLEDs (chromaticity (x = 0.14, y = 0.16), 15.4 lx, MSPFD of 0.28 μmol/m 2 /s, relative MSPFD 75%) [ 115 ] and found no significant exposure angle-dependent effect on the autonomic indices of HRV.…”

Section: Discussionmentioning

confidence: 99%

Blue Light—Ocular and Systemic Damaging Effects: A Narrative Review

Antemie

Samoilă

Clichici

2023

IJMS

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Light is a fundamental aspect of our lives, being involved in the regulation of numerous processes in our body. While blue light has always existed in nature, with the ever-growing number of electronic devices that make use of short wavelength (blue) light, the human retina has seen increased exposure to it. Because it is at the high-energy end of the visible spectrum, many authors have investigated the theoretical harmful effects that it poses to the human retina and, more recently, the human body, given the discovery and characterization of the intrinsically photosensitive retinal ganglion cells. Many approaches have been explored, with the focus shifting throughout the years from examining classic ophthalmological parameters, such as visual acuity, and contrast sensitivity to more complex ones seen on electrophysiological assays and optical coherence tomographies. The current study aims to gather the most recent relevant data, reveal encountered pitfalls, and suggest future directions for studies regarding local and/or systemic effects of blue light retinal exposures.

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Difference in autonomic nervous effect of blue light depending on the angle of incidence on the eye

Cited by 4 publications

References 20 publications

Carbon Dot/Cellulose-Based Transparent Films for Efficient UV and High-Energy Blue Light Screening

Carbon Dot/Cellulose-Based Transparent Films for Efficient UV and High-Energy Blue Light Screening

Ambient-task combined lighting to regulate autonomic and psychomotor arousal levels without compromising subjective comfort to lighting

Blue Light—Ocular and Systemic Damaging Effects: A Narrative Review

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